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#1 | |
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Join Date: May 2006
Location: Texas, Lake Ray Hubbard and NH, Long Island Winnipesaukee
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![]() Quote:
I think they listed that it had over 200 hours at this point, which indicates it probably ready for a valve job and other maintenance activities that are required to keep high performance engines running and performing..... So 99K is probably pretty fair..... Considering all maintenance work is going to be X 3
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#2 | |
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Join Date: Feb 2008
Location: Gilford, NH / Welch Island
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Dan
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#3 | |
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Join Date: Jan 2005
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Even the Merc "blue" motors such as the 525 are meant to have the top ends serviced every few hundred hours. |
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#4 |
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Depends on how hard they are driven. Wear increases with the square of speed (in RPM) and internal heat (a function of how much HP is being generated) beats on the valves making them "tulip". Run those engines at 3000 RPM and they'll likely run for 1000 hours without any issues. Run them at WOT, they'll likely need a top end overhaul at 50 hours or less.
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#5 |
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...and at 3000-rpm the boat could be doing about 45-mph in the daylight....plus the lower revs will save big on gas too!
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